A distinctive feature of eukaryotes is the organization of tightly packaged chromosomal DNA with proteins into a membrane-bound structure called a:
A. nucleus.
B. cell.
C. plasma membrane.
D. nucleolus.
Answer: A
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Flagella move in a whip-like motion.
Answer the following statement true (T) or false (F)
To turn genes off, a regulatory protein called a(n) ________ is bound to a regulatory site so that RNA polymerase is blocked.
A. translator B. operon C. signal molecule D. repressor
The chemical 5-bromouracil mimics the chemical structure of thymine, making it a(n) (analog/nucleotide/precursor) of thymine
What will be an ideal response?
Which of the following statements is false?
(a) Mitotic Cdk must be phosphorylated by an activating kinase (Cak) before it is active. (b) Phosphorylation of mitotic Cdk by the inhibitory kinase (Wee1) makes the Cdk inactive, even if it is phosphorylated by the activating kinase. (c) Active M-Cdk phosphorylates the activating phosphatase (Cdc25) in a positive feedback loop. (d) The activating phosphatase (Cdc25) removes all phosphates from mitotic Cdk so that M-Cdk will be active.